Thanks for the comments-The ignition is simply a grill ignitor that I split to three points . (I have been experimenting with a converted disposable flash but haven't gotten as hot a spark as with a grill ignitor.)

The Barrel is 1.5 "The Chamber is 4"

It makes one hell of a boom with Aqua Net.

The box holds a fan circuit that runs for about 20sec when pressed. It is housed in what is best described as an Altoids tin.

ThanksI am considering propane-This was a small comission for a friend who paid me for expenses so i did not want to go to pricey. I would appreciate advise on what next. Should i go for a propane fueled gun with a stun gun ignitor or try my hands at pneumatic? I do like the hell of a bang that comes from combustion. But would like the power of pneumatic. I really like building them more than firing so I'd have to find someone to sell it to. I'd just sell it for cost so i could go on to the next stage.

Mark that is one wicked gun in your avatar-That barrel looks better than six feet?

Thought i posted this reply already but it does not appear-sorry if repost.

What fuel do you reccomend? I intend making a propane after the pnuematic. I gave this one to my friend Gbeast so i don't want to mod the gun but if there is a better spray fuel I'd like to recommend it to him,

Anyone tried aersolized alcohol?

The fan is puchased from Radio Shack. It is a 12 volt model a little under 2" in diameter.

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